Jambmaths question:
|
Age in years |
10 |
11 |
12 |
|
No. of pupil |
6 |
27 |
7 |
The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old.
Option A:
$\frac{17}{20}$
Option B:
$\frac{33}{40}$
Option C:
$\frac{27}{40}$
Option D:
$\frac{3}{30}$
Jamb Maths Solution:
The word “at least 11” mean including age 11 and above .
Total number of pupil = 40
Those pupil from at least 11 years = 27 +7 = 34
Probability that a pupil chosen at random is at least 11 years old= $\frac{34}{40}=\frac{17}{20}$
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